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Resistance Meters

Sensors / Detectors -- Main Page


Last Updated: November 22, 2021 02:42 PM

Circuits Designed by Dave Johnson, P.E. :
Tests UL Ground Resistance -  UL requires that an electrical system using a metal chassis earth ground connection have a resistance of less than 0.1ohms.  This resistance must be tested with actual line current in excess or 10 amps.  The circuit shown uses a couple of LEDs to indicate if in fact the resistance is less than 0.1ohms - modified on july 10, 2006 . . . Hobby Circuit designed by David A. Johnson P.E.-April, 2001

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-778-8407




Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:

10 Amp UL Ground Resistance Tester -  UL requires that an electrical system using a metal chassis earth ground connection have a resistance of less than 0.1ohms.   This resistance must be tested with actual line current in excess or 10 amps.    The circuit shown uses a couple of LEDs to indicate . . . Circuit by David Johnson P.E.-April, 2001

Accurately measure resistance with less-than-perfect components -  11-Nov-04 EDN Design Ideas:  For transducers, such as strain gauges or thermistors, you must accurately and inexpensively measure resistance using circuitry built with imperfect components and in which gain and offset errors can significantly limit the accuracy of ohmic measurements.  The right circuit topology makes it possible to eliminate most error terms while measuring ohms, leaving the accuracy to be determined by jus Design by Dave Van Ess, Cypress Semiconductor

Equivalent Series Resistance meter -  Use this handy device to find all those degraded electrolytic capacitors!  __ Designed by Manfred Mornhinweg

Grounded Resistor Tunes Oscillator -  29-May-03 EDN Design Ideas:  To vary the frequency of any sine-wave oscillator, you should use a pair of ganged variable resistors, and you should thoroughly match their characteristics over the entire variation range to satisfy the oscillator's balancing conditions.  This restriction leads to problems in the tuning range and high cost, thereby limiting the range of applications Design by Vladimir Tepin, Taganrog, Russia

High-Resistance Meter -  This resistance meter can measure resistances up to 200 mega-ohms.  The value of the resistance is indicated on a linear meter scale (0-100 uA).  The operation of the circuit is based__ Electronics Projects for You

Low-Resistance Continuity Tester -  Using this circuit you can check continuity of low-resistance paths such as PCB tracks, small coils, intermediate-frequency transformers (iFTs) and low-resistance transformers.  However, you canít check semiconductors with this tester.__ Electronics Projects for You

Optimize linear-sensor resolution -  03/07/02 EDN Design Ideas:  A wide variety of sensors and transducers of physical phenomena work via the mechanism of variable resistance.  These devices sense temperature, light, pressure, humidity, conductivity, and force, for example.  Such sensors measure the physical parameter of interest by reading out the inherent parameter-sensitive resistance or conductance Design by Steve Woodward, University of North Carolina, Chapel Hill, NC

Resistance Calculator Yields Precise Values -  08/03/95 EDN Design Ideas:  For times when the nearest preferred resistor value isn't close enough to the desired value, a program comes in handy. (You'll find the executable ZiPfile and several source-code files for the program in EDN BBS /Di_SiG #1740.) The program finds all combinations of two series or parallel connected resistors, within a specified tolerance of the required value, using only preferred values from the E6, E12, E24, and E96 ranges (6, 12, 24, and 96 different values per decade).    Design by David Kirkby, Department of Medical Physics, University College London, London, UK

Resistance Measurement using Sample & Hold Method -  A sample and hold circuit, as the name implies, samples an analogue input signal and holds its value until the input is again sampled.Fig.1 shows the basic principle of the__ Electronics Projects for You

Tests UL Ground Resistance -  UL requires that an electrical system using a metal chassis earth ground connection have a resistance of less than 0.1ohms.  This resistance must be tested with actual line current in excess or 10 amps.  The circuit shown uses a couple of LEDs to indicate if in fact the resistance is less than 0.1ohms - modified on july 10, 2006 . . . Hobby Circuit designed by David A. Johnson P.E.-April, 2001


Resistance Meters / Detectors / Sensors


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